Drilling machine and the like



Dec. 5, 1933. R. M. LOVEJOY DRILLING MACHINE AND THE LIKE Filed Aug. 22,1951 l7 Sheets-Sheet 1 \nvenTor. Ralph M.\ ovejoy b mgnwkm AHys.

Dec. 5, 1933. Q R, M. LOVEJOY 1,938,107

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DRILLING MACHINE AND THE LIKE Filed Aug. 22, 1931 17 She'ets-Sheet 11Ralph M. Lovejoy Dec. 5, 1933. R. M. LOVEJOY 1,933,107

DRILLING MACHINE AND THE LIKE Filed Aug. 22, 1931 17 Sheets-Sheet 12 HUS25 In'venTor.

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Patented Dec. 5, 1933 UNITED STATES PATENT OFFICE 44 Claims.

This invention relates to improvements in drilling machines and machinesfor other purposes, particularly those of the type in which the work iscarried by a travelling carrier successively to aplurality of stations,at certain of'which it is operated upon by a tool such as a drill, acountersink, a reamer, a tapping tool, or other suitable tool.

More specifically the invention relates to improvements in automaticdrilling machines and the like disclosed in my prior patents fordrilling machines and machines for other purposes, No. 1,799,594 and1,799,595, granted April 7, 1931; and in my prior applications, Ser. No.441,387, filed February 3, 1930, for improvements in Fluid operatedcontrol for multi-spindle drills; Ser. No. 471,234, filed July 28, 1930,for Fluid operated control for multi-spindle drills; and Ser. No.504,798, filed December 26, 1930, for Indexing mechanism for automaticdrilling machines.

The general object of the present invention is to simplify theconstructions disclosed in my prior patents and applications aforesaid,and to produce certain improvements in the indexing mechanism, thecontrolling mechanism for the timing thereof relatively to the operationof the tools; and in the mechanism for supporting and actuating thetools, while retaining the advantageous features of the mechanisms of myprior constructions for producing speed and accuracy of indexing and thesafety mechanism for preventing interference of the indexing and toolactuating mechanisms.

The mechanisms disclosed in my prior patents and applications comprisesector-shape work supporting members which are slidably mounted upon atravelling carrier, means for actuating the carrier to present worksupporting members successively at a plurality of tool stations, meansfor arresting the carrier with the work positioned at such stations,fluid actuated means for looking the work supporting members accuratelyat such stations irrespective of the correct indexing of the travellingcarrier, fluid actuated controlling mechanism for causing the actuationof the tool feeding mechanisms after the work supporting members arelocked at the respective tool stations, and means operable by themovement of the tool supporting members away from the work to releasethe locking means for the work supporting members and thereupon toinitiate the action of the carrier indexing mechanism.

In the constructions disclosed in my prior patents and applications thelocking mechanism for the work supporting sectors is released when thetools have been withdrawn from the work and raised to a predeterminedheight, so that the sectors are enabled to be moved freely upon thetravelling carrier. When, during the operation of the machine, greatertime is required to secure the work to the sector than that which isrequired for feeding the .tools into the work and. withdrawal of thetools from the work to the predetermined height the unlocking of thesectors permits them to be moved during the clamping of the work uponthem. Such movement of the sectors not only makes it more difficult tosecure the work to them but also it is likely to permit such movementthereof .as to force dirt or other dbris between the inner ends of thesector and the ring against which they abut thereby interfering with theaccuracy of the position of the work supporting sectors.

One of the important features of the present invention is to providefluid actuated controlling means of such character that the worksupporting sectors will remain in locked position during the entireperiod of movement of the tools to and from the Work, and also duringthe time at which the work carrier is at rest, in other words, untiljust before beginning the tool feeding operation.

In my prior patents and applications mechanical means are provided forfeeding the tools towards and into the work at a substantially uniformrate of speed. Another object of the present invention is to providefluid-operated means for feeding the tools up to the work at a.relatively greater speed than during the operation of the tools upon thework.

Another object of the invention is to provide means for increasing therate of feed to the tools when passing through an aperture in the worksuch as a core-hole and thereafter resuming the usual rate of feed.

Another object of the invention is to providea novel means forcontrolling the fluid-actuated feeding mechanism.

Another object of the invention is to provide novel tapping mechanismwith means for reversing the direction of the rotation of the tap forthe purpose of tapping screw threads into the work and withdrawing thetap without injury to the screw threads.

Another object of, the invention is to provide coordinated valvemechanisms controlled by cams upon a single cam shaft and operable todetermine the sequence of operation of the various mechanisms of themachine.

These and other objects and features of the invention will more fullyappear from the following description and accompanying drawings, and'will be particularly pointed out in claims.

' In the drawings:

Fig. 1 is a general view of a multiple drill construction embodied inthe invention.

Fig. 2 is a plan view of the same.

Fig. 3 is a detail horizontal sectional view showing the stopping andstarting mechanism for the travelling carrier.

Fig. 4 is a view mainly in vertical section of the reciprocable toolsupporting and driving mechanism.

Fig. 5 is a detail view in horizontal section of the guiding mechanismof lines 5-5. Fig. 4.

Fig. 6 is a detail view of one of the guides for the tool slide.

Fig. 7 is a view partly in longitudinal section, and partly inelevation, of the reciprocable tool supporting and driving mechanism.

Fig. 8 is a side elevation of the control box and driving motor for thecontrolling mechanism.

Fig. 9 is a view partially in vertical section, and partially inelevation, showing the mechanism for driving a cam shaft in the controlbox.

Fig. 10 is an enlarged detail view partly in plan, and partly inhorizontal section, of the control box and the mechanism for controllingthe flow of fluid under pressure which actuates various parts of themachine and regulates the sequence of operation.

Fig. 11 is an enlarged detail view, mainly in vertical section, of thecam actuated valve for rapid traverse controlling mechanism for thetools, on line 11-11, Fig. 10.

Fig. 12 is a diagrammatic view illustrating the conduits and course offluid under pressure when the machine is at rest.

Fig. 13 is a similar diagrammatic view showing the conduits and courseof fluid under pressure when the tools are in operation.

Fig. 14 is an enlarged detail view, mainly in vertical section, of thecam actuated master valve for controlling the flow of fluid underpressure on line 14-14, Fig. 10, and also illustrating the cam actuatedmechanism for controlling the normal feed of the tools.

Fig. 15 is a detail view, mainly in vertical section, longitudinally, ofthe clutch controlling valve.

Fig. 16 is an enlarged detail view on line 1&- 16, Fig. 17, of themechanism for controlling the rapid and relatively slow feedingmovements of the tool supporting .and actuating mechanism.

Fig. 17 is a plan view of the mechanism illustrated in Fig. 16.

Fig. 18 is a detail view of a modified controlling mechanism for varyingthe rate of feeding of the tool to permit it to pass more rapidlythrough an aperture such as a core-hole in the work.

Fig. 19 is a side elevation of the tapping mechanism.

Fig. 20 is a detail view, mainly in longitudinal section, of the feedingand actuating mechanism for a tapping or screw threading tool, andshowing also the controlling mechanism therefor.

Fig. 21 is a detail sectional view of the brake mechanism for the tooldrive of the tapping mechanism, on line 21-21, Fig. 19.

Fig. 22 is an enlarged detail view, mainly in vertical section, of themotor reversing mechanism for the tapping tool on line 22-22, Fig. 23.

Fig. 23 is a sectional view of the switch for the tapping mechanism onthe line 23-23 of Fig. 22.

Fig. 24 is an enlarged detail view, partially in elevation, andpartially in vertical section, of the units 3", C, and D", shown in Fig.25, illustrating the same in the positions occupied when the travellingcarrier is at rest and the feeler extended into the socket in thetravelling carrier.

Fig. 25 is a plan view of the controlling units shown in Fig. 24 inconnection with unit J and the solenoid operated valve of the electricalsafety current.

Fig. 26 is a sectional view on the line 26-26 of Fig. 25.

Fig. 27 is a plan view of the controlling unit 8 for the table indexingfluid actuated motor.

Fig. 28- is a sectional view on the line 28-28 of Fig. 27.

Fig. 29 is a sectional view on the line 29-29 of Fig. 27. 8.

Much of the construction of the present ma- The fluid operatedcontrolling mechanism disclosed in aforesaid prior patents orapplications comprise essentially; 1) automatically operable 9. meansfor preventing the operation of the means for actuating the travellingcarrier, unless and until all of the tools have been moved to apredetermined distance from the work; (2) fluid controlled means forpreventing actuation of the 104 means for locking the rotating tableunless the work is approximately positioned properly at the several toolstations; (3) fluid operated means for preventing actuation of the toolfeeding means unless and until the work is properly positioned 10, atthe tool stations and locked in such positions;

(4) means for preventing the actuation of the tool feeding means untilthe locking of the work carrier is completed.

The mechanisms for accomplishing these func- 1 tions which are disclosedin my prior patents or applications comprise a source of fluid underpressure and interrelated controlling units in the piping system leadingfrom the source of fluid under pressure to the table locking mechanismand the mechanism for controlling respectively the actuation of therotating table, the locking and unlocking of the table, the actuationand arrest of the tool feeding mechanism, and the safety control forpreventing actuation of the 1;; tools unless and until the table islocked with the work positioned at the tool station. Many of the sameunits are employed in substantially the same construction and in thesame relation in the present invention, and inasmuch as they are de- 3;,scribed in detail in the prior applications aforesaid need not beillustrated or described in detail in this application, except in suchrespects as slight changes in construction of the several units modifiestheir action to effect the same purpose, while permitting the omissionof certain other units rendered unnecessary by such modification.

The units which are common to the present construction and to theconstructions disclosed in my prior applications, particularly Ser. No.504,- 798, comprise the following:

Unit B-By-pass control valve Unit C"-Table feeler release Unit "-Mainpressure cut off valve Unit E-Main admission valve Unit -Distributorvalve Unit -Manual safety switch Unit K"-Fluid control for tablearresting mechanism Unit LControl for fluid operated motors L3 Theseunits are identified upon the drawings herein by the same letters.

The construction illustrated in the accompanying drawings comprises aheavy hollow base 1, desirably of substantially cylindrical form,providing a reservoir for oil or other suitable fluid, and whichpreferably is of substantially the same construction as shown in myprior patents or applications, more particularly application Ser. No.504,798. A travelling carrier in the form of a rotatable table 2 ismounted upon the base and carries a plurality of independent worksupporting members 3, preferably in theform of flat sectors which areslidably supported upon the table 2 and are movable relatively theretoboth radially and circumferentially in my'prior Patent No. 1,799,594.positioning means also provided at each tool station and are operable toposition and lock the work supporting sectors against a central ring inaccurately predetermined positions at each tool station, irrespective ofthe correct positioning of the travelling carrier, in the mannerdisclosed in my priorpatent aforesaid.

The upper closed end of the base is provided with an upwardly extendingcentral cylindrical boss 5, (see Fig. 3), upon which a hub 6 extendingdownwardly from the table '2 is rotatably Fluid operated mounted. Theupper end of the ,base is also provided with an upwardly extendingintermediate flange 7 which provides a support for the table near itsperiphery. The base is also provided with an outer upwardly extendingflange 8 providing a space between it and the flange 7 for a peripheralapron depending from the table. The flange 8 is also utilized as abase-for the tool supporting and actuating mechanism.

The mechanism for rotating the travelling carrier or table may be, anddesirably is, of the same construction as disclosed in my priorapplication Ser. No. 504,798, and comprises an actuating ring 9 which isrotatably mounted upon the hub 6 of the table, and is provided with apawl 10 adapted to engage blocks 11 fixedly secured to the hub of thetable and spaced apart at suitable distances to enable the work supportswhich are carried by the table to be properly indexed to successiverotating mechanism. In

tool stations. The actuating ring 9' is rotated to cause the pawl 10 toengage the block 11 and move it in a proper direction by link mechanismwhich is operated by a hydraulic motor 12, and after the table has beenproperly positioned and locked the actuating ring is returned to itsoriginal position by anotherv hydraulic motor 13, as disclosed in myprior application Ser. No. 504,798, aforesaid.

The rotating movement of the table is arrested by mechanism similar tothat disclosed in said prior application Ser. No. 504,798, whichcomprises apivotally and slidably mounted latch or stop 14, connected bya link to the piston 15 of a dash pct 16, which is supplied by fluidunder constant pressure. The piston 15 of the dash pot is provided witha bevelled portion communicating with the port through which constantpressure is supplied in such manner as gradually to cut off the supplyof fluid under pressure against the piston as the piston is movedinwardly, thus gradually arresting the movement of the table. The pistonrod is provided with a block 1'7 having seated in a recess therein anadjustable block 18, which is adapted to engage the plunger 19 of asupplemental dash pot 20 to insure accurate stoppage of the table inproperly indexed position. In my prior application Ser. No. 504,798,this dash pot, which is referred to as unit K, comprises also a valvefor controlling the supply of fluid to unit L which controls theoperation of the table the present case this the manner disclosed in,

4 mounted upon the base are table; and another arm which is secured tothe shaft 22 which is located within the chamber of the base, isactuated by the movement of the spring pressed arm as it rides off therespective blocks-in properly timed relation to restore the by-passvalve (unit B) to'initial position, in

the manner disclosed in my prior application aforesaid. Thesequence ofoperation of the various mechanisms will hereafter be more fullydescribed.

The invention is illustrated herein as applied to drilling and tappingmechanism, and comprises a plurality of like mechanisms located atcertain of. the tool stations for feeding and actuating drills or boringtools, and also comprises similar mechanism of modified construction forsupporting and actuating a tap for screw threading the wall of a bore inthe work.

The tool supporting and actuating mechanisms of parallel girders 23,which are mounted at their outer ends upon a filler block 24, which issecured to or may be formed integral with, the peripheral flange 8 ofthe base 1, and are mounted at their inner ends upon a ring 25 which issecured to the hub of the base and overlies the inner ends of thesectors 3. The supports for the tool feeding and actuating mechanismcomprise a pair of columns having reduced end portions which fit intosockets in blocks 26 which are bolted to the girders 23, the lower endsof the columns desirably being welded to the blocks, thereby providing arigid construction. One of the columns desirably has a'lower section 27of rectangular cross-section and an upper section 28 of cylindricalcross-section, while the other column is constructed so as to provide alower section presenting flat side, and rear faces and a V-shape-frontsurface 29, and an upper section 30 of cylindrical cross-section. Theupper ends of the columns are provided with integral cylindricalextensions of reduced cross-sectional area which extend through a topplate 31, and are provided with screw threaded upper ends to receivesuitable nuts for clamping the plate 31 firmly upon the columns.

The preferred form of tool carrier or slide comprises a rectangularbox-like construction having end plates 32 which are located inproximity to the respective columns and side plates 33, which are boltedto the end plates, as illustrated in Fig.

5. The end plates desirably extend above and below the side plates. Thebox-like construction formed by the end and side plates is provided withan upper rigid head 34 and a lower rigid head 35,

each of which is fixedly secured to the end and inner race of thebearing and is clamped there- 159

